Adaptive Optics and Full-field OCT: the expected gain

2018 ◽  
Author(s):  
Peng Xiao ◽  
Viacheslav Mazlin ◽  
Jules Scholler ◽  
Mathias Fink ◽  
Claude Boccara
Keyword(s):  
Adaptive Optics ◽  
Full Field ◽  
Expected Gain

scholarly journals Subaperture correlation based digital adaptive optics for full field optical coherence tomography

2013 ◽  
Vol 21 (9) ◽  
pp. 10850 ◽  
Author(s):  
Abhishek Kumar ◽  
Wolfgang Drexler ◽  
Rainer A. Leitgeb
Keyword(s):  
Optical Coherence Tomography ◽  
Adaptive Optics ◽  
Optical Coherence ◽  
Full Field

Unlock Condensate Reserves by Peripheral Development of Giant Condensate

2021 ◽  
Author(s):  
Nouf Sulaiman Al Yaaqoubi ◽  
Zainah Salem Al Agbari ◽  
Maxim Sudarev ◽  
Eduard Latypov ◽  
Ihab Nabil Mohamed ◽  
...  
Keyword(s):  
Simulation Modeling ◽  
Gas Production ◽  
Gas Condensate ◽  
Sweep Efficiency ◽  
Full Field ◽  
Field Development ◽  
Expected Gain ◽  
Peripheral Area ◽  
Condensate Reservoir ◽  
Future Prediction

Abstract This paper addresses the development of peripheral area in order to maximize the condensate production in a giant Recycle Gas-Condensate Reservoir in UAE. The condensate reservoir is producing many years under recycling mode to maintain the pressure and maximize the gas condensate recovery. The producers and injector wells are in a line drive pattern where the injected fluid is lean gas to maintain 100% VRR. The condensate production declined through the years due to gradual pressure decrease as well as injected lean gas/N2 breakthrough. Several studies were done to increase condensate recovery and extend gas production plateau. The methodology adopted for this study is the developing of the peripheral area in the giant recycle reservoir as part of its full field development plan (FFDP) in order to provide more pressure support initially and to increase the sweep efficiency for more condensate recovery. In addition; it is worth to mention that peripheral wells will provide production relaxation from some gas produces which have lean gas and N2 breakthroughs. Pilot wells were drilled to examine and confirm the strategy assumed by analyzing the performance of those wells in terms of location, condensate production, CGR values and trajectory. Simulation modeling was as well used for matching purposes and future prediction and forecasting. Pilot wells were drilled in deferent peripheral area in the reservoir and completed as horizontal gas producers. By analyzing the current wells performance it has been approved that the wells are producing high condensate about (2000-2500) MMstb and producing high CGR values about (80-100). Simulation modeling were utilize for future prediction and confirmed that the development of peripheral area by drilling additional wells enhances the sweeping efficiency and participated in expected gain a multimillions of barrels of additional condensate with maintaining the same business plan gas production target. It was promising to have more incremental in case of ramping up the production. The paper discussed in detail about methodology adopted in order to unlock the condensate reserves by peripheral development and confirmed the results of the gain of condensate production and CGR from actual data and simulation modeling. The provided information is quite informative to be widely used and applied in similar reservoirs.

scholarly journals Kilohertz retinal FF-SS-OCT and flood imaging with hardware-based adaptive optics

2020 ◽  
Author(s):  
Denise Valente ◽  
Kari V. Vienola ◽  
Robert J. Zawadzki ◽  
Ravi S. Jonnal
Keyword(s):  
Adaptive Optics ◽  
High Speed ◽  
Imaging System ◽  
Optical Design ◽  
Attractive Potential ◽  
Swept Source ◽  
Full Field ◽  
Common Path ◽  
Cmos Sensor ◽  
Volumetric Images

AbstractA retinal imaging system was designed for full-field (FF) swept-source (SS) optical coherence tomography (OCT) with cellular resolution. The system incorporates a real-time adaptive optics (AO) subsystem and a very high speed CMOS sensor, and is capable of acquiring volumetric images of the retina at rates up to 1 kHz. While digital aberration correction (DAC) is an attractive potential alternative to AO, it has not yet been shown to provide resolution of cones in the fovea, where early detection of functional deficits is most critical. Here we demonstrate that FF-SS-OCT with hardware AO permits resolution of foveal cones, with volume rates adequate to measure light-evoked changes in photoreceptors. With the reference arm blocked, the system can operate as kilohertz AO flood illumination fundus camera with adjustable temporal coherence and is expected to allow measurement of light-evoked changes caused by common path interference in photoreceptor outer segments (OS). In this work, we describe the system’s optical design, characterize its performance, and demonstrate its ability to produce images of the human photoreceptor mosaic.

scholarly journals Investigating the causes of stimulus-evoked changes in cone reflectance using a combined adaptive optics SLO-OCT system

2021 ◽  
Author(s):  
Mehdi Azimipour ◽  
Denise Valente ◽  
John S Werner ◽  
Robert J Zawadzki ◽  
Ravi S Jonnal
Keyword(s):  
Adaptive Optics ◽  
High Volume ◽  
Phase Changes ◽  
Functional Responses ◽  
Full Field ◽  
Physiological Processes ◽  
Potential Applications ◽  
In Vivo Functional Imaging ◽  
Ophthalmic Disease

In vivo functional imaging of human photoreceptors is an emerging field, with compelling potential applications in basic science, translational research, and clinical management of ophthalmic disease. Measurements of light-evoked changes in the photoreceptors has been successfully demonstrated using adaptive optics (AO) coherent flood illumination (CFI), AO scanning light ophthalmoscopy (SLO), AO optical coherence tomography (OCT), and full-field OCT with digital AO (dAO). While the optical principles and data processing of these systems differ greatly, and while these differences manifest in the resulting measurements, we believe that the underlying physiological processes involved in each of those techniques are likely the same. AO CFI and AOSLO systems are more widely used than OCT systems. However, those systems produce only two-dimensional images and so, less can be said about the anatomical and physiological origins of the observed signal. OCT signal, on the other hand, provides 3D imaging but at a cost of high volume of data, making it impractical to clinical purposes. In light of this, we employed a combined AO OCT SLO system with point for point correspondence between the OCT and SLO images to measure functional responses simultaneously with both and investigate SLO retinal functional biomarkers based on OCT response. The resulting SLO images reveal reflectance changes in the cones which are consistent with those previously reported using AO CFI and AO SLO. The resulting OCT volumes show phase changes in the cone outer segment (OS) consistent with those previously reported by us and others. We recapitulate a model of the cone OS previously proposed to explain AO-CFI reflectance changes, and show how this model can be used to predict the signal in AO SLO. The limitations of the model is also discussed in this manuscript.

Mechanical Oscillations Simulation of an Adaptive Flexible Mirror

2015 ◽  
Vol 792 ◽  
pp. 546-550
Author(s):  
Feodor Kanev ◽  
Nailia Makenova ◽  
Roman Nesterov
Keyword(s):  
Adaptive Optics ◽  
Information Transfer ◽  
Control Algorithm ◽  
Active Element ◽  
Nonlinear Crystal ◽  
Phase Conjugation ◽  
Full Field ◽  
Mechanical Oscillations ◽  
Reflecting Surface ◽  
Adaptive Optics System

The whole model of adaptive optics system of energy and information transfer should include a model of an active element [1] construction of which is defined by parameters of the system and beam control algorithm. In the algorithm of full-field phase conjugation a nonlinear crystal or two flexible mirrors with a layer of free space between them are usually employed [2, 3], while a system of phase conjugation requires a flexible mirror as an active element [4]. In the paper the model of a flexible mirror is considered which takes into account dynamic oscillation of reflecting surface.

Adding the third dimension on adaptive optics retina imager thanks to full-field optical coherence tomography

2009 ◽  
Author(s):  
Marie Blavier ◽  
Leonardo Blanco ◽  
Marie Glanc ◽  
Florence Pouplard ◽  
Sarah Tick ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Adaptive Optics ◽  
Optical Coherence ◽  
Full Field ◽  
The Third ◽  
Third Dimension

Retinal imaging with adaptive optics full-field OCT

2017 ◽  
Author(s):  
Peng Xiao ◽  
Mathias Fink ◽  
A. Claude Boccara
Keyword(s):  
Adaptive Optics ◽  
Retinal Imaging ◽  
Full Field
Sign in / Sign up

Export Citation Format

Share Document